Instruction Manual
D100423X012
V500 Valve
July 2017
8
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing area may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings.
D Check with your process or safety engineer for any other hazards that may be present from exposure to process media.
Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions.
As used in these instructions, the term “actuator” refers to power actuators (such as pneumatic diaphragm or piston
actuators) or manual actuators (such as handwheel or handlever actuators).
Packing Maintenance
Key numbers are referenced in figures 11 and 13 unless otherwise indicated.
Note
For the ENVIRO‐SEAL packing system, refer to the Parts Ordering section for retrofit kits and parts kits(see figure 14). Refer to the
separate ENVIRO‐SEAL instruction manual for maintenance instructions.
Standard ENVIRO‐SEAL packing systems can be used in vacuum service with packing rings in the standard orientation. It is not
necessary to reverse the ENVIRO‐SEAL PTFE packing rings.
Stopping Leakage
All maintenance procedures in this section may be performed with the valve body (key 1) in the line.
For packing other than spring‐loaded packings, leakage around the packing follower (key 14) can be stopped by
tightening the packing flange nuts (key 16). If leakage cannot be stopped in this manner, replace the packing
according to the Replacing Packing procedure.
If the packing is relatively new and tight on the valve shaft (key 3), and if tightening the packing nuts does not stop
leakage, it is possible that the valve shaft is worn or nicked so that a seal cannot be made. If the leakage comes from
the outside diameter of the packing, it is possible that the leakage is caused by nicks or scratches on the packing box
wall. Inspect the shaft and packing box wall for nicks or scratches when performing the following procedures.
Replacing Packing
Note
If the valve has ENVIRO‐SEAL live‐loaded packing installed, see the separate ENVIRO‐SEAL instruction manual.
This procedure may be performed without removing the actuator from the valve body if adding PTFE/composition
packing rings as a temporary measure. However, the actuator must be removed if replacing any other kind of packing
or if the metal packing parts (keys 14, 17, and, if used, 18) need to be replaced.
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